   !function () {
         //封装方法，压缩之后减少文件大小
         function get_attribute(node, attr, default_value) {
             return node.getAttribute(attr) || default_value;
         }
 
         //封装方法，压缩之后减少文件大小
         function get_by_tagname(name) {
             return document.getElementsByTagName(name);
         }
 
         //获取配置参数
         function get_config_option() {
             var scripts = get_by_tagname("script"),
                 script_len = scripts.length,
                 script = scripts[script_len - 1]; //当前加载的script
             return {
                 l: script_len, //长度，用于生成id用
                 z: get_attribute(script, "zIndex", -1), //z-index
                 o: get_attribute(script, "opacity", 0.8), //opacity
                 c: get_attribute(script, "color", "255,255,255"), //color
                 n: get_attribute(script, "count", 350) //count
             };
         }
 
         //设置canvas的高宽
         function set_canvas_size() {
             canvas_width = the_canvas.width = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth,
                 canvas_height = the_canvas.height = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight;
         }
 
         //绘制过程
         function draw_canvas() {
             context.clearRect(0, 0, canvas_width, canvas_height);
             //随机的线条和当前位置联合数组
             var e, i, d, x_dist, y_dist, dist; //临时节点
             //遍历处理每一个点
             random_points.forEach(function (r, idx) {
                 r.x += r.xa,
                     r.y += r.ya, //移动
                     r.xa *= r.x > canvas_width || r.x < 0 ? -1 : 1,
                     r.ya *= r.y > canvas_height || r.y < 0 ? -1 : 1, //碰到边界，反向反弹
                     context.fillRect(r.x - 0.5, r.y - 0.5, 1, 1); //绘制一个宽高为1的点
                 //从下一个点开始
                 for (i = idx + 1; i < all_array.length; i++) {
                     e = all_array[i];
                     // 当前点存在
                     if (null !== e.x && null !== e.y) {
                         x_dist = r.x - e.x; //x轴距离 l
                         y_dist = r.y - e.y; //y轴距离 n
                         dist = x_dist * x_dist + y_dist * y_dist; //总距离, m
 
                         dist < e.max && (e === current_point && dist >= e.max / 2 && (r.x -= 0.03 * x_dist, r.y -= 0.03 * y_dist), //靠近的时候加速
                             d = (e.max - dist) / e.max,
                             context.beginPath(),
                             context.lineWidth = d / 2,
                             context.strokeStyle = "#000000",
                             context.moveTo(r.x, r.y),
                             context.lineTo(e.x, e.y),
                             context.stroke());
                     }
                 }
             }), frame_func(draw_canvas);
         }
 
         //创建画布，并添加到body中
         var the_canvas = document.createElement("canvas"), //画布
             config = get_config_option(), //配置
             canvas_id = "c_n" + config.l, //canvas id
             context = the_canvas.getContext("2d"), canvas_width, canvas_height,
             frame_func = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function (func) {
                 window.setTimeout(func, 1000 / 40);
             }, random = Math.random,
             current_point = {
                 x: null, //当前鼠标x
                 y: null, //当前鼠标y
                 max: 20000 // 圈半径的平方
             },
             all_array;
         the_canvas.id = canvas_id;
         the_canvas.style.cssText = "position:fixed;top:0;left:0;z-index:" + config.z + ";opacity:" + config.o;
         get_by_tagname("body")[0].appendChild(the_canvas);
 
         //初始化画布大小
         set_canvas_size();
         window.onresize = set_canvas_size;
         //当时鼠标位置存储，离开的时候，释放当前位置信息
         window.onmousemove = function (e) {
             e = e || window.event;
             current_point.x = e.clientX;
             current_point.y = e.clientY;
         }, window.onmouseout = function () {
             current_point.x = null;
             current_point.y = null;
         };
         //随机生成config.n条线位置信息
         for (var random_points = [], i = 0; config.n > i; i++) {
             var x = random() * canvas_width, //随机位置
                 y = random() * canvas_height,
                 xa = 2 * random() - 1, //随机运动方向
                 ya = 2 * random() - 1;
             // 随机点
             random_points.push({
                 x: x,
                 y: y,
                 xa: xa,
                 ya: ya,
                 max: 6000 //沾附距离
             });
         }
         all_array = random_points.concat([current_point]);
         //0.1秒后绘制
         setTimeout(function () {
             draw_canvas();
         }, 100);
     }();